Companion Dog Patellar Luxation: Knee Pain and Treatment

Patellar luxation is a common painful knee condition in small and toy breed dogs that causes lameness and chronic discomfort, often requiring surgical correction for good welfare outcomes.

Key Facts

Patellar luxation is the most common orthopedic condition in small dogs, affecting up to 7 percent of the population
The kneecap slips out of its groove causing sudden lameness and chronic pain
Small breeds including Chihuahuas, Pomeranians, and Yorkshire Terriers are most affected
Severe cases cause dogs to carry the affected leg intermittently or continuously
Surgical correction is highly effective and most dogs return to normal function within months
Selective breeding for extremely small body size increases the risk of conformational orthopedic problems

Welfare Considerations

Patellar luxation imposes chronic intermittent pain that significantly affects quality of life in affected dogs. The sudden kneecap displacement causes acute episodes of lameness during which dogs carry the leg or show signs of acute pain. Chronic low-grade discomfort between episodes affects activity levels and behavior. Many cases are underdiagnosed because owners attribute leg-carrying to minor strains. Surgical correction for moderate to severe cases reliably resolves pain and restores function — making delayed treatment a welfare concern. The high prevalence in small breeds reflects selective breeding priorities that favor miniaturization over orthopedic soundness.

What You Can Do

Schedule a veterinary orthopedic examination if your small dog shows intermittent leg-carrying
Seek specialist opinion on surgical options for dogs with moderate to severe patellar luxation
Consider orthopedic health when choosing a small breed dog and ask breeders about health testing
Support breed standards that prioritize conformational health over extreme miniaturization
Donate to organizations funding research into orthopedic conditions in companion animals